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Non-Cash Financing and Investing Activities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Disclosure Of Non Cash Investing And Financing Information [Line Items]
Non-cash acquisition of outdoor advertising assets	$ 23,941
Non-cash investing activity		4,000
Payments for deposits		1,900
Total purchase price		11,539
Non-cash financing activity			0
LAMAR MEDIA CORP [Member]
Supplemental Disclosure Of Non Cash Investing And Financing Information [Line Items]
Non-cash acquisition of outdoor advertising assets	23,941
Non-cash investing activity		4,000
Payments for deposits		1,900
Total purchase price		11,539
Non-cash financing activity			$ 0

The value of an asset or business acquired in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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